An alien is in a bar sitting next to this guy.  Every time he takes a drink, he spins on his stool, pokes the guy next to him and goes bzzz.
He does these two or three times. Finally the guy gets annoyed and tells the alien that if he doesn't quit it, he will beat him up.
The alien takes a drink, spins his stool, pokes the guy and goes bzzz.
This infuriates the man, and he takes him outside and pulls down his pants and stands back aghast.
"There's nothing there! How so you people have sex?" The alien smiles, and goes bzzz.

Q:What is the speed of sex?
A: 68 because at 69 you have to turn around!!!!!